Java tutorial
/** * This file Copyright (c) 2005-2008 Aptana, Inc. This program is * dual-licensed under both the Aptana Public License and the GNU General * Public license. You may elect to use one or the other of these licenses. * * This program is distributed in the hope that it will be useful, but * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or * NONINFRINGEMENT. Redistribution, except as permitted by whichever of * the GPL or APL you select, is prohibited. * * 1. For the GPL license (GPL), you can redistribute and/or modify this * program under the terms of the GNU General Public License, * Version 3, as published by the Free Software Foundation. You should * have received a copy of the GNU General Public License, Version 3 along * with this program; if not, write to the Free Software Foundation, Inc., 51 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Aptana provides a special exception to allow redistribution of this file * with certain other free and open source software ("FOSS") code and certain additional terms * pursuant to Section 7 of the GPL. You may view the exception and these * terms on the web at http://www.aptana.com/legal/gpl/. * * 2. For the Aptana Public License (APL), this program and the * accompanying materials are made available under the terms of the APL * v1.0 which accompanies this distribution, and is available at * http://www.aptana.com/legal/apl/. * * You may view the GPL, Aptana's exception and additional terms, and the * APL in the file titled license.html at the root of the corresponding * plugin containing this source file. * * Any modifications to this file must keep this entire header intact. */ package com.aptana.ide.editor.css; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; import org.eclipse.core.runtime.IConfigurationElement; import org.eclipse.core.runtime.IExtension; import org.eclipse.core.runtime.IExtensionPoint; import org.eclipse.core.runtime.IExtensionRegistry; import org.eclipse.core.runtime.Platform; import org.eclipse.jface.preference.IPreferenceStore; import org.eclipse.jface.util.IPropertyChangeListener; import org.eclipse.jface.util.PropertyChangeEvent; import com.aptana.ide.editor.css.preferences.IPreferenceConstants; import com.aptana.ide.editors.UnifiedEditorsPlugin; /** * Browser extension reader that returns the list of browsers to show previews with when an editor asks. Listens to the * browser preview preferences so the list contains all browsers that should be shown in alphabetical order. * * @author Kevin Sawicki (ksawicki@aptana.com) */ public final class BrowserExtensionLoader { // List of all browsers private static List<IConfigurationElement> browserList = null; private static List<String> allBrowsers = null; // List of all browsers that are current set to be shown in the preferences private static List<IConfigurationElement> showList = new ArrayList<IConfigurationElement>(); // Listener for changes to preview preferences private static IPropertyChangeListener propertyChangeListener = new IPropertyChangeListener() { public void propertyChange(PropertyChangeEvent event) { if (IPreferenceConstants.CSSEDITOR_BROWSER_PREVIEW_PREFERENCE.equals(event.getProperty())) { computeShowList(); } } }; private static String OS = Platform.getOS(); private BrowserExtensionLoader() { // does nothing } /** * Looks up the label for the browser based on the os run on. * * @param browserElement - * element containing label node(s) * @return - browser label if found, null otherwise */ public static String getBrowserLabel(IConfigurationElement browserElement) { String label = null; boolean found = false; IConfigurationElement[] ce = browserElement.getChildren(UnifiedEditorsPlugin.LABEL_NODE); for (int k = 0; k < ce.length && !found; k++) { if (ce[k].getAttribute(UnifiedEditorsPlugin.OS_ATTR) != null && ce[k].getAttribute(UnifiedEditorsPlugin.VALUE_ATTR) != null) { if (OS.equals(ce[k].getAttribute(UnifiedEditorsPlugin.OS_ATTR))) { label = ce[k].getAttribute(UnifiedEditorsPlugin.VALUE_ATTR); found = true; } } } return label; } /** * Computes an alpabetized list of browsers to show previews for. */ private static void computeShowList() { showList.clear(); String browserString = CSSPlugin.getDefault().getPreferenceStore() .getString(IPreferenceConstants.CSSEDITOR_BROWSER_PREVIEW_PREFERENCE); String[] browsers_names = browserString.split(","); //$NON-NLS-1$ // See comment below about mac fix IConfigurationElement safari = null; IConfigurationElement element; int size = browserList.size(); for (int i = 0; i < size; i++) { element = browserList.get(i); // See comment below about mac fix String name = getBrowserLabel(element); if (safari == null && "Safari".equals(name)) //$NON-NLS-1$ { safari = element; } if (name != null) { boolean show = false; for (int k = 0; k < browsers_names.length && !show; k++) { if (name.equals(browsers_names[k])) { show = true; } } if (show) { showList.add(element); } } } // Fix for users with currently only the Firefox preview added, this will add the safari first so the start // page/web views won't break anymore for these users if (OS.equals(Platform.OS_MACOSX)) { if (showList.size() == 1) { element = showList.get(0); IPreferenceStore store = CSSPlugin.getDefault().getPreferenceStore(); store.removePropertyChangeListener(propertyChangeListener); if (getBrowserLabel(element).equals("Firefox")) //$NON-NLS-1$ { if (safari != null) { showList.add(0, safari); // Add safari back to prefs store.setValue(IPreferenceConstants.CSSEDITOR_BROWSER_PREVIEW_PREFERENCE, browserString + ",Safari"); //$NON-NLS-1$ } else { showList.clear(); // Clear prefs completely store.setValue(IPreferenceConstants.CSSEDITOR_BROWSER_PREVIEW_PREFERENCE, ""); //$NON-NLS-1$ } } store.addPropertyChangeListener(propertyChangeListener); } } } /** * Returns the list of browser extension points to show. To be called by an HTML editor. * * @return - List of loadable browsers */ public static List<IConfigurationElement> loadBrowsers() { if (browserList == null) { browserList = new ArrayList<IConfigurationElement>(); IExtensionRegistry reg = Platform.getExtensionRegistry(); IExtensionPoint ep = reg.getExtensionPoint(UnifiedEditorsPlugin.BROWSER_EXTENSION_POINT); IExtension[] extensions = ep.getExtensions(); CSSPlugin.getDefault().getPreferenceStore().addPropertyChangeListener(propertyChangeListener); IConfigurationElement[] ce; String browserClass; String browserName; for (int i = 0; i < extensions.length; i++) { ce = extensions[i].getConfigurationElements(); for (int j = 0; j < ce.length; j++) { browserClass = ce[j].getAttribute(UnifiedEditorsPlugin.CLASS_ATTR); browserName = getBrowserLabel(ce[j]); if (browserClass != null && browserName != null) { browserList.add(ce[j]); } } } Collections.sort(browserList, new Comparator<IConfigurationElement>() { public int compare(IConfigurationElement o1, IConfigurationElement o2) { String name1 = getBrowserLabel(o1); String name2 = getBrowserLabel(o2); if (name1 != null && name2 != null) { // This is to put the browsers in reverse alphabetical order so Firefox is always last since // that affects loading on Mac OS X. Basically 'Safari' must come before 'Firefox' if (Platform.getOS().equals(Platform.OS_MACOSX)) { return name2.compareTo(name1); } // For all other platforms do standard alphabetical order return name1.compareTo(name2); } return 0; } }); computeShowList(); } return showList; } /** * Gets all the browsers that exist in the extension point * * @return - list of browser labels */ public static List<String> getAllBrowserLabels() { if (allBrowsers == null) { allBrowsers = new ArrayList<String>(); IExtensionRegistry reg = Platform.getExtensionRegistry(); IExtensionPoint ep = reg.getExtensionPoint(UnifiedEditorsPlugin.BROWSER_EXTENSION_POINT); IExtension[] extensions = ep.getExtensions(); IConfigurationElement[] ce; String browserClass; String browserName; for (int i = 0; i < extensions.length; i++) { ce = extensions[i].getConfigurationElements(); for (int j = 0; j < ce.length; j++) { browserClass = ce[j].getAttribute(UnifiedEditorsPlugin.CLASS_ATTR); browserName = BrowserExtensionLoader.getBrowserLabel(ce[j]); if (browserClass != null && browserName != null) { allBrowsers.add(browserName); } } } Collections.sort(allBrowsers, new Comparator<String>() { public int compare(String name1, String name2) { if (name1 != null && name2 != null) { return name1.compareTo(name2); } return 0; } }); } return allBrowsers; } }